001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * ---------------
028 * LineNeedle.java
029 * ---------------
030 * (C) Copyright 2002-2006, by the Australian Antarctic Division and
031 * Contributors.
032 *
033 * Original Author: Bryan Scott (for the Australian Antarctic Division);
034 * Contributor(s): David Gilbert (for Object Refinery Limited);
035 *
036 * $Id: LineNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 mungady Exp $
037 *
038 * Changes:
039 * --------
040 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
041 * 27-Mar-2003 : Implemented Serializable (DG);
042 * 09-Sep-2003 : Added equals() method (DG);
043 * 08-Jun-2005 : Implemented Cloneable (DG);
044 *
045 */
046
047 package org.jfree.chart.needle;
048
049 import java.awt.Graphics2D;
050 import java.awt.Shape;
051 import java.awt.geom.Line2D;
052 import java.awt.geom.Point2D;
053 import java.awt.geom.Rectangle2D;
054 import java.io.Serializable;
055
056 /**
057 * A needle that is represented by a line.
058 */
059 public class LineNeedle extends MeterNeedle
060 implements Cloneable, Serializable {
061
062 /** For serialization. */
063 private static final long serialVersionUID = 6215321387896748945L;
064
065 /**
066 * Draws the needle.
067 *
068 * @param g2 the graphics device.
069 * @param plotArea the plot area.
070 * @param rotate the rotation point.
071 * @param angle the angle.
072 */
073 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074 Point2D rotate, double angle) {
075
076 Line2D shape = new Line2D.Double();
077
078 double x = plotArea.getMinX() + (plotArea.getWidth() / 2);
079 shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY());
080
081 Shape s = shape;
082
083 if ((rotate != null) && (angle != 0)) {
084 /// we have rotation
085 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
086 s = getTransform().createTransformedShape(s);
087 }
088
089 defaultDisplay(g2, s);
090
091 }
092
093 /**
094 * Tests another object for equality with this object.
095 *
096 * @param obj the object to test (<code>null</code> permitted).
097 *
098 * @return A boolean.
099 */
100 public boolean equals(Object obj) {
101 if (obj == this) {
102 return true;
103 }
104 if (!(obj instanceof LineNeedle)) {
105 return false;
106 }
107 if (!super.equals(obj)) {
108 return false;
109 }
110 return true;
111 }
112
113 /**
114 * Returns a clone of this needle.
115 *
116 * @return A clone.
117 *
118 * @throws CloneNotSupportedException if the <code>LineNeedle</code>
119 * cannot be cloned (in theory, this should not happen).
120 */
121 public Object clone() throws CloneNotSupportedException {
122 return super.clone();
123 }
124
125 }
126